Research has long since shown that the most successful long term romantic relationships have, on average, five positive exchanges for every one negative exchange. It has literally been proven that those relationships where the negative exchanges are greater than one to every five positives are more than likely to dissolve quicker.
I remember when I first read this research. I was in a relationship with my ex at the time and we must have had 20 negative exchanges for every one positive! Although that definitely wasn’t the right relationship for me, perfectly happy couples can easily get into a rut of mentioning the negative and ignoring the positives. So if you want to ensure a longstanding intimate relationship make sure to compliment your partner and show appreciation for them, their contribution to the relationship and the thoughtful or kind things they do as often as possible.